JP5435136B2 - Lower structure of the car body - Google Patents

Lower structure of the car body Download PDF

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JP5435136B2
JP5435136B2 JP2012526458A JP2012526458A JP5435136B2 JP 5435136 B2 JP5435136 B2 JP 5435136B2 JP 2012526458 A JP2012526458 A JP 2012526458A JP 2012526458 A JP2012526458 A JP 2012526458A JP 5435136 B2 JP5435136 B2 JP 5435136B2
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vehicle
battery
width direction
sill
vehicle body
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JPWO2012014776A1 (en
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朝一 前田
健 小野寺
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/04—Arrangement of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/157—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body for side impacts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/02—Side panels
    • B62D25/025—Side sills thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438—Arrangement under the floor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection

Description

本発明は、フロアの下部にバッテリを搭載した車体の下部構造に関する。   The present invention relates to a lower structure of a vehicle body in which a battery is mounted on a lower part of a floor.

電気自動車などの電動車両には、通常、モータの動力源となるバッテリが搭載されている（例えば、日本国 特開平５−３０５８７９号公報を参照）。この日本国 特開平５−３０５８７９号公報に記載された電気自動車においては、車体の左右両側に配置したサイドシル、リアピラー、リアサイドメンバ同士を車幅方向に沿って延在する４本のクロスメンバを介して連結し、これらのクロスメンバの間に前記バッテリを収容配置している。   An electric vehicle such as an electric vehicle is usually equipped with a battery serving as a power source for the motor (see, for example, Japanese Patent Application Laid-Open No. 5-305879). In the electric vehicle described in Japanese Patent Laid-Open No. 5-305879, the side sills, rear pillars, and rear side members disposed on the left and right sides of the vehicle body are interposed via four cross members extending along the vehicle width direction. The batteries are accommodated between these cross members.

また、後方上側に配置されたクロスメンバの車幅方向端部と、リアピラー下端部とサイドシルとの交差部と、を略直線状に延びる伝達リンクを介して連結している。この伝達リンクは、車両前方に向かうにつれて車幅方向外側かつ下方に向けて延びている。   Moreover, the vehicle width direction edge part of the cross member arrange | positioned at back upper side and the intersection part of a rear pillar lower end part and a side sill are connected via the transmission link extended in substantially linear form. The transmission link extends outward and downward in the vehicle width direction toward the front of the vehicle.

従って、車両に前方から後方に向けて荷重が入力された場合に、前記クロスメンバが前方に移動するのを前記伝達リンクによって支持することにより、バッテリを保護することができる。   Therefore, when a load is input from the front to the rear of the vehicle, the battery can be protected by supporting the cross member moving forward by the transmission link.

しかしながら、かかる従来の車体構造では、車両に対して側方から荷重が入力された場合には、バッテリを確実に保護するために、前記伝達リンクの板厚を上げる必要があり、車体重量の増大を招くおそれがあった。   However, in such a conventional vehicle body structure, when a load is input to the vehicle from the side, it is necessary to increase the plate thickness of the transmission link in order to reliably protect the battery, which increases the vehicle body weight. There was a risk of inviting.

そこで、本発明は、車体に側方から荷重が入力した場合に、車体重量の増大を抑制しつつバッテリを確実にかつ効率良く保護することができる車体の下部構造を提供するものである。   Therefore, the present invention provides a lower structure of a vehicle body that can reliably and efficiently protect a battery while suppressing an increase in the weight of the vehicle body when a load is input to the vehicle body from the side.

本発明に係る車体の下部構造にあっては、車幅方向両側に配置され、車両前後方向に沿って延在するサイドシルと、フロアパネルの下面に接合され、前記サイドシルよりも上側でかつ車幅方向内側に車両前後方向に沿って延在するサイドメンバと、前記サイドメンバの下部とサイドシルの上側とを連結する第１連結部材と、前記サイドメンバの下部とサイドシルの下側とを連結する第２連結部材と、を備えたことを最も主要な特徴とする。   In the lower structure of the vehicle body according to the present invention, the side sill is arranged on both sides in the vehicle width direction and extends along the vehicle front-rear direction, and is joined to the lower surface of the floor panel. A side member extending in the vehicle front-rear direction, a first connecting member for connecting a lower portion of the side member and an upper side of the side sill, and a first member for connecting the lower portion of the side member and the lower side of the side sill. The main feature is that it includes two connecting members.

本発明によれば、車両側方からサイドシルに荷重が入力された場合に、サイドメンバは高さ位置が略一定のまま回転するため、車体重量の増大を抑制しつつバッテリを確実にかつ効率良く保護することができる。   According to the present invention, when a load is input to the side sill from the side of the vehicle, the side member rotates while the height position is substantially constant, so that the battery is reliably and efficiently suppressed while suppressing an increase in the weight of the vehicle body. Can be protected.

図１は、本発明の実施形態にかかる車体の下部構造を車幅方向に沿って切断した状態を車両前方から見た横断面図である。FIG. 1 is a cross-sectional view of a state in which a lower structure of a vehicle body according to an embodiment of the present invention is cut along the vehicle width direction, as viewed from the front of the vehicle. 図２は、図１のＡ−Ａ線による断面図である。2 is a cross-sectional view taken along line AA in FIG. 図３は、車体の下部構造の横断面図であり、（ａ）は側方からの荷重入力前の通常状態を示す図１に対応した断面図であり、（ｂ）はサイドシルに側方から荷重が入力された初期段階を示し、（ｃ）はサイドシルに側方から荷重が入力された最終段階を示す。FIG. 3 is a cross-sectional view of the lower structure of the vehicle body, (a) is a cross-sectional view corresponding to FIG. 1 showing a normal state before load input from the side, and (b) is a side view of the side sill. The initial stage in which the load is input is shown, and (c) shows the final stage in which the load is input to the side sill from the side.

以下、本発明の実施形態について図面を参照しつつ詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１〜図３は、本発明の実施形態にかかる車体の下部構造の一実施形態を示している。なお、本実施形態においては、いわゆる高床式フロアが設けられた電気自動車を例にとって説明するが、電気自動車以外にも、いわゆるハイブリッド車等にも適用可能である。   1 to 3 show an embodiment of a lower structure of a vehicle body according to an embodiment of the present invention. In the present embodiment, an electric vehicle provided with a so-called high floor type floor will be described as an example, but the present invention can be applied to a so-called hybrid vehicle in addition to the electric vehicle.

図１に示すように、車体のフロアパネル１は、車両前後方向および車幅方向に沿って略水平状に延設されている。車両の車幅方向両側には、車両前後方向に沿って延びる左右一対のサイドシル３，３が配設されている。このサイドシル３は、断面ハット状のシルアウタ５とシルインナ７とから構成されている。具体的には、シルアウタ５とシルインナ７の上側フランジ同士９，９を互いに接合すると共に、シルアウタ５とシルインナ７の下側フランジ同士１１，１１を互いに接合することによって、矩形状の閉断面構造に形成している。   As shown in FIG. 1, the floor panel 1 of the vehicle body extends substantially horizontally along the vehicle longitudinal direction and the vehicle width direction. On both sides in the vehicle width direction of the vehicle, a pair of left and right side sills 3, 3 extending along the vehicle front-rear direction are disposed. The side sill 3 includes a sill outer 5 and a sill inner 7 having a hat-shaped cross section. Specifically, the upper flanges 9 and 9 of the sill outer 5 and the sill inner 7 are joined together, and the lower flanges 11 and 11 of the sill outer 5 and the sill inner 7 are joined together to form a rectangular closed cross-section structure. Forming.

また、サイドシル５よりも車幅方向内側でかつ上側には、断面ハット状のサイドメンバ１３がフロアパネル１の下部に車両前後方向に沿って延在している。即ち、サイドメンバ１３は、下側に配置された底面１５と、該底面１５の左右両端から屈曲して上方に延びる側面１７，１７と、該側面１７の上端から車幅方向に屈曲して延びる上端フランジ１９とから一体形成されている。前記上端フランジ１９がフロアパネル１の下面１ｂに接合されることによって、サイドメンバ１３は閉断面構造に構成されている。   Further, a side member 13 having a hat-like cross section extends along the vehicle front-rear direction below the floor panel 1 on the inner side and the upper side of the side sill 5 in the vehicle width direction. That is, the side member 13 includes a bottom surface 15 disposed on the lower side, side surfaces 17 and 17 extending upward from the left and right ends of the bottom surface 15, and bending and extending from the upper end of the side surface 17 in the vehicle width direction. It is integrally formed with the upper end flange 19. When the upper end flange 19 is joined to the lower surface 1b of the floor panel 1, the side member 13 has a closed cross-sectional structure.

さらに、サイドメンバ１３の下方には、上面２１、側面２３，２４および底面２５からなる断面矩形状の閉断面構造のバッテリフレーム２７が車両前後方向に沿って延設されている。ここで、バッテリ支持部材２６は、前記バッテリフレーム２７と、バッテリ２９を支持すると共に車幅方向端部３１ａがバッテリフレーム２７の底面２５に接合されたバッテリトレイ３１と、前記バッテリ２９を上側から覆うように配設され、車幅方向端部３３ａがバッテリフレーム２７の上面２１に接合されたバッテリカバー３３とから構成されている。このように、バッテリ支持部材２６は、サイドメンバ１３の下側に配置されると共にバッテリ２９を支持している。そして、前記バッテリフレーム２７は、バッテリ支持部材２６の外周部分に相当し、内部が中空状の閉断面構造に形成された筒状体である。   Further, below the side member 13, a battery frame 27 having a closed cross-sectional structure having a rectangular cross section composed of an upper surface 21, side surfaces 23 and 24, and a bottom surface 25 extends in the vehicle front-rear direction. Here, the battery support member 26 supports the battery frame 27 and the battery 29 and covers the battery 29 from above with the battery tray 31 having the vehicle width direction end portion 31a joined to the bottom surface 25 of the battery frame 27. And a battery cover 33 having a vehicle width direction end portion 33a joined to the upper surface 21 of the battery frame 27. Thus, the battery support member 26 is disposed below the side member 13 and supports the battery 29. The battery frame 27 corresponds to the outer peripheral portion of the battery support member 26, and is a cylindrical body having an inside with a hollow closed cross-sectional structure.

前記サイドシル３を構成するシルインナ７の下端面３５（下側）の車幅方向内側端部と前記サイドメンバ１３の底面１５（下部）の車幅方向外側端部とは、第２連結部材である外側クロスメンバ３７によって連結されている。このように、第２連結部材である外側クロスメンバ３７は、サイドメンバ１３の下部とサイドシル３の下側とを連結している。また、該外側クロスメンバ３７の内方（上側）には、第１連結部材であるブレースメンバ３９が配設されている。該ブレースメンバ３９は、外側端部３９ａがフロアパネル１の接合端部１ａとシルインナ７の上端面４１とによって挟持され、内側端部３９ｂは、サイドメンバ１３の底面１５と外側クロスメンバ３７の内側端部３７ａによって挟持されている。このように、第１連結部材であるブレースメンバ３９は、サイドメンバ１３の下部とサイドシル３の上側とを連結している。   The vehicle width direction inner side end portion of the lower end surface 35 (lower side) of the sill inner 7 constituting the side sill 3 and the vehicle width direction outer side end portion of the bottom surface 15 (lower portion) of the side member 13 are second connecting members. They are connected by an outer cross member 37. As described above, the outer cross member 37 as the second connecting member connects the lower part of the side member 13 and the lower side of the side sill 3. A brace member 39 as a first connecting member is disposed on the inner side (upper side) of the outer cross member 37. The brace member 39 has an outer end 39 a sandwiched between the joining end 1 a of the floor panel 1 and the upper end surface 41 of the sill inner 7, and the inner end 39 b is connected to the bottom 15 of the side member 13 and the inner side of the outer cross member 37. It is clamped by the end 37a. Thus, the brace member 39 as the first connecting member connects the lower part of the side member 13 and the upper side of the side sill 3.

また、バッテリフレーム２７の車幅方向外側の側面２３（車幅方向外側）とサイドメンバ１３とは、第３連結部材である連結ブラケット４３を介して上下方向に沿って連結されている。具体的には、連結ブラケット４３の上端には、車幅方向に延びる上端フランジ４３ａが形成され、下端には下端フランジ４３ｂが形成されている。上端フランジ４３ａは外側クロスメンバ３７の内側端部３７ａの下面に接合され、下端フランジ４３ｂはバッテリフレーム２５の車幅方向外側の側面２３に接合されている。なお、前記外側クロスメンバ３７の外側端部３７ｂは、サイドシル３の下端面３５に接合されている。また、バッテリカバー３３の上方には、内側クロスメンバ４５が配設されており、車幅方向外側の端部４５ａが下方に屈曲し、サイドメンバ１３の側面に接合されている。   Further, the side surface 23 (outside in the vehicle width direction) of the battery frame 27 in the vehicle width direction and the side member 13 are connected in the vertical direction via a connection bracket 43 that is a third connection member. Specifically, an upper end flange 43a extending in the vehicle width direction is formed at the upper end of the connection bracket 43, and a lower end flange 43b is formed at the lower end. The upper end flange 43 a is joined to the lower surface of the inner end portion 37 a of the outer cross member 37, and the lower end flange 43 b is joined to the side surface 23 of the battery frame 25 on the outer side in the vehicle width direction. The outer end 37b of the outer cross member 37 is joined to the lower end surface 35 of the side sill 3. An inner cross member 45 is disposed above the battery cover 33, and an end 45 a on the outer side in the vehicle width direction is bent downward and joined to the side surface of the side member 13.

図２に示すように、フロアパネル１の下部には、車幅方向に沿って延びる内側クロスメンバ４５，４５が前側と後側とに一対に配設されている。該内側クロスメンバ４５は、断面ハット状に形成されており、底面４７と、該底面４７の両端から上方に屈曲して延びる側面４９，４９と、該側面４９の上端から前後方向に屈曲して延びる上端フランジ５１とから一体形成されている。なお、図１は、前側に配置された内側クロスメンバ４５における断面図である。   As shown in FIG. 2, a pair of inner cross members 45, 45 extending along the vehicle width direction are disposed at the lower part of the floor panel 1 on the front side and the rear side. The inner cross member 45 is formed in a hat shape in cross section, and includes a bottom surface 47, side surfaces 49 and 49 that are bent upward from both ends of the bottom surface 47, and a front and rear direction bent from the upper end of the side surface 49. It is integrally formed with the extending upper end flange 51. FIG. 1 is a cross-sectional view of the inner cross member 45 disposed on the front side.

また、内側クロスメンバ４５，４５の下部には、図１で説明したバッテリ２９，２９が前後に配置されており、これらのバッテリ２９，２９の間に別の大型バッテリ５３が搭載されている。大型バッテリ５３の高さは、バッテリ２９よりも大きいため、バッテリカバー３３は前後方向中央部５５が上方に突出した形状に形成されている。   Further, the batteries 29, 29 described with reference to FIG. 1 are arranged at the front and back of the inner cross members 45, 45, and another large battery 53 is mounted between the batteries 29, 29. Since the height of the large battery 53 is larger than that of the battery 29, the battery cover 33 is formed in a shape in which the center portion 55 in the front-rear direction protrudes upward.

次いで、本実施形態に係る車体の下部に側方から荷重が入力された場合の変形状態を説明する。   Next, a deformation state when a load is input from the side to the lower portion of the vehicle body according to the present embodiment will be described.

図３（ａ）に示す通常状態の車体下部のサイドシル３に対して車幅方向外側から内側に向けて荷重が入力されると、サイドシル３からブレースメンバ３９および外側クロスメンバ３７を介してサイドメンバ１３の底面１５に荷重が伝達される。また、フロアパネル１の接合端部１ａは、ブレースメンバ３９を介してシルインナ７の上端面４１に接合されているため、フロアパネル１を介してサイドメンバ１３の上端フランジ１９にも荷重が伝達される。ここで、サイドシル３の上側からフロアパネル１を介してサイドメンバ１３の上部に伝達される荷重よりも、サイドシル３の下側からブレースメンバ３９および外側クロスメンバ３７を介してサイドメンバ１３の下部に伝達される荷重の方が大きくなる。   When a load is input from the outer side in the vehicle width direction to the inner side with respect to the side sill 3 in the lower part of the vehicle body in the normal state shown in FIG. The load is transmitted to the bottom surface 15 of 13. Further, since the joining end portion 1 a of the floor panel 1 is joined to the upper end surface 41 of the sill inner 7 via the brace member 39, the load is transmitted to the upper end flange 19 of the side member 13 via the floor panel 1. The Here, the load transmitted from the upper side of the side sill 3 to the upper part of the side member 13 via the floor panel 1 is lower than the lower side member 13 via the brace member 39 and the outer cross member 37 from the lower side of the side sill 3. The transmitted load is larger.

従って、図３（ｂ）（ｃ）に示すように、サイドメンバ１３が車両前方から見て時計回り方向（即ち、サイドメンバ１３の上部が車幅方向外側で、下部が車幅方向内側に向かう方向）に回転する。この回転に伴って、フロアパネル１および内側クロスメンバ４５が変形する。ここで、連結ブラケット４３は、上端フランジ４３ａが外側クロスメンバ３７およびブレースメンバ３９を介してサイドメンバ１３の底面１５に接合されると共に、下端フランジ４３ｂがバッテリフレーム２７の側面２３に接合されている。従って、前記下端フランジ４３ｂがバッテリフレーム２７の上面２１に接合されている場合に比較して、サイドメンバ１３の上方移動が抑制される。つまり、サイドメンバ１３は、高さ位置が略一定のまま回転するため、バッテリフレーム２７も上方移動が抑制され、バッテリトレイ３１の変形も抑制される。   Therefore, as shown in FIGS. 3B and 3C, the side member 13 is clockwise when viewed from the front of the vehicle (that is, the upper side of the side member 13 is outward in the vehicle width direction, and the lower part is inward in the vehicle width direction). Direction). With this rotation, the floor panel 1 and the inner cross member 45 are deformed. Here, the upper end flange 43 a of the connection bracket 43 is joined to the bottom surface 15 of the side member 13 via the outer cross member 37 and the brace member 39, and the lower end flange 43 b is joined to the side surface 23 of the battery frame 27. . Therefore, the upward movement of the side member 13 is suppressed as compared with the case where the lower end flange 43 b is joined to the upper surface 21 of the battery frame 27. That is, since the side member 13 rotates while the height position is substantially constant, the upward movement of the battery frame 27 is also suppressed, and the deformation of the battery tray 31 is also suppressed.

以下に、本実施形態による作用効果を説明する。   Below, the effect by this embodiment is demonstrated.

（１）本実施形態に係る車体の下部構造は、車幅方向両側に配置され、車両前後方向に沿って延在するサイドシル３と、フロアパネル１の下面１ｂに接合され、前記サイドシル３よりも上側でかつ車幅方向内側に車両前後方向に沿って延在するサイドメンバ１３と、前記サイドメンバ１３の下部とサイドシル３の上側とを連結するブレースメンバ３９（第１連結部材）と、前記サイドメンバ１３の下部とサイドシル３の下側とを連結する外側クロスメンバ３７（第２連結部材）と、を備えている。 (1) The lower structure of the vehicle body according to the present embodiment is disposed on both sides in the vehicle width direction, joined to the side sill 3 extending along the vehicle front-rear direction, and the lower surface 1b of the floor panel 1. A side member 13 extending along the vehicle longitudinal direction on the upper side and in the vehicle width direction; a brace member 39 (first connecting member) for connecting a lower portion of the side member 13 and an upper side of the side sill 3; The outer cross member 37 (2nd connection member) which connects the lower part of the member 13 and the lower side of the side sill 3 is provided.

従って、車両側方からサイドシル３に荷重が入力された場合に、サイドシル３からブレースメンバ３９および外側クロスメンバ３７を介してサイドメンバ１３の底面１５に荷重が伝達される。一方、フロアパネル１を介してサイドメンバ１３の上端フランジ１９にも荷重が伝達される。ここで、サイドシル３の上側からフロアパネル１を介してサイドメンバ１３の上部に伝達される荷重よりも、サイドシル３の下側からブレースメンバ３９および外側クロスメンバ３７を介してサイドメンバ１３の下部に伝達される荷重の方が大きくなる。すると、サイドメンバ１３が車両前方から見て時計回り方向（即ち、サイドメンバ１３の上部が車幅方向外側で、下部が車幅方向内側に向かう方向）に回転する。このように、サイドメンバ１３は、高さ位置が略一定のまま回転するため、バッテリフレーム２７も上方移動が抑制され、バッテリトレイ３１の変形も抑制される結果、バッテリ２９がサイドメンバ１３に接触することが防止される。これにより、車体重量の増大を抑制しつつ側方から荷重が入力した場合にバッテリ２９を確実にかつ効率良く保護することができる。   Therefore, when a load is input to the side sill 3 from the side of the vehicle, the load is transmitted from the side sill 3 to the bottom surface 15 of the side member 13 via the brace member 39 and the outer cross member 37. On the other hand, the load is also transmitted to the upper end flange 19 of the side member 13 through the floor panel 1. Here, the load transmitted from the upper side of the side sill 3 to the upper part of the side member 13 via the floor panel 1 is lower than the lower side member 13 via the brace member 39 and the outer cross member 37 from the lower side of the side sill 3. The transmitted load is larger. Then, the side member 13 rotates in the clockwise direction when viewed from the front of the vehicle (that is, the upper side of the side member 13 is the outer side in the vehicle width direction and the lower side is the inner side in the vehicle width direction). Thus, since the side member 13 rotates with the height position being substantially constant, the battery frame 27 is also prevented from moving upward, and the deformation of the battery tray 31 is also suppressed. As a result, the battery 29 contacts the side member 13. Is prevented. Thus, the battery 29 can be reliably and efficiently protected when a load is input from the side while suppressing an increase in the weight of the vehicle body.

（２）本実施形態に係る車体の下部構造は、前記サイドメンバ１３の下側に配置されると共にバッテリ２９を支持するバッテリ支持部材２６と、前記バッテリ支持部材２６のバッテリフレーム２７（外周部分）の車幅方向外側と前記サイドメンバ１３とを連結する連結ブラケット４３（第３連結部材）と、を更に備えている。 (2) The lower structure of the vehicle body according to the present embodiment includes a battery support member 26 that is disposed below the side member 13 and supports the battery 29, and a battery frame 27 (outer peripheral portion) of the battery support member 26. And a connecting bracket 43 (third connecting member) for connecting the outer side in the vehicle width direction and the side member 13.

従って、連結ブラケット４３の下端フランジ４３ｂがバッテリフレーム２７の上面２１に接合されている場合に比較して、車両側方からサイドシル３に荷重が入力された場合に、サイドメンバ１３の上方移動が抑制される。つまり、サイドメンバ１３は、高さ位置が略一定のまま回転するため、バッテリフレーム２７も上方移動が抑制され、バッテリトレイ３１の変形も抑制される。   Therefore, compared with the case where the lower end flange 43b of the connection bracket 43 is joined to the upper surface 21 of the battery frame 27, the upward movement of the side member 13 is suppressed when a load is input to the side sill 3 from the vehicle side. Is done. That is, since the side member 13 rotates while the height position is substantially constant, the upward movement of the battery frame 27 is also suppressed, and the deformation of the battery tray 31 is also suppressed.

（３）また、前記バッテリフレーム２７は、内部が中空状の閉断面構造に形成された筒状体である。 (3) The battery frame 27 is a cylindrical body having a closed cross-sectional structure with a hollow inside.

図３（ｃ）に示すように、車両側方から荷重が入力された場合にバッテリフレーム２７は、車幅方向外側の側面２３が、車幅方向内側の側面２４に対して相対的に上方移動して、断面略平行四辺形の形状に変形する。ここで、バッテリフレーム２７は、内部が中空状の閉断面構造に形成された筒状体であるため、断面略平行四辺形への変形が効率的に阻害されることがない。   As shown in FIG. 3 (c), when a load is input from the side of the vehicle, the battery frame 27 has the side surface 23 on the outer side in the vehicle width direction moved upward relative to the side surface 24 on the inner side in the vehicle width direction. Then, the cross section is deformed into a substantially parallelogram shape. Here, since the battery frame 27 is a cylindrical body formed in a closed cross-sectional structure having a hollow shape, deformation into a substantially parallelogram cross-section is not efficiently inhibited.

なお、本発明の車体の下部構造は、本発明の要旨を逸脱しない範囲で各種変更が可能である。たとえば電気自動車に限ることなくバッテリを搭載して稼働する車両であれば本発明を適用することができる。   Various modifications can be made to the lower structure of the vehicle body of the present invention without departing from the gist of the present invention. For example, the present invention can be applied to any vehicle that is mounted and operated without being limited to an electric vehicle.

産業上の利用の可能性Industrial applicability

本発明に係る車体の下部構造によれば、車両側方からサイドシルに荷重が入力された場合に、サイドメンバは高さ位置が略一定のまま回転するため、車体重量の増大を抑制しつつバッテリを確実にかつ効率良く保護することができる。   According to the lower structure of the vehicle body according to the present invention, when a load is input to the side sill from the side of the vehicle, the side member rotates while the height position is substantially constant. Can be reliably and efficiently protected.

Claims (3)

車幅方向両側に配置され、車両前後方向に沿って延在するサイドシルと、
フロアパネルの下面に接合され、前記サイドシルよりも上側でかつ車幅方向内側に車両前後方向に沿って延在するサイドメンバと、
前記サイドメンバの下部とサイドシルの上側とを連結する第１連結部材と、
前記サイドメンバの下部とサイドシルの下側とを連結する第２連結部材と、
を備えたことを特徴とする車体の下部構造。Side sills arranged on both sides in the vehicle width direction and extending along the vehicle longitudinal direction;
A side member joined to the lower surface of the floor panel, extending above the side sill and inward in the vehicle width direction along the vehicle longitudinal direction;
A first connecting member for connecting the lower part of the side member and the upper side of the side sill;
A second connecting member that connects a lower portion of the side member and a lower side of the side sill;
The undercarriage of the vehicle body characterized by comprising 請求項１に記載の車体の下部構造であって、
前記サイドメンバの下側に配置されると共にバッテリを支持するバッテリ支持部材と、
前記バッテリ支持部材の外周部分の車幅方向外側と前記サイドメンバとを連結する第３連結部材と、を更に備えたことを特徴とする車体の下部構造。The vehicle body substructure according to claim 1,
A battery support member disposed below the side member and supporting the battery;
A lower structure of a vehicle body further comprising a third connecting member that connects an outer side in a vehicle width direction of an outer peripheral portion of the battery support member and the side member. 請求項２に記載の車体の下部構造であって、
前記バッテリ支持部材の外周部分は、内部が中空状の閉断面構造に形成された筒状体であることを特徴とする車体の下部構造。The vehicle body substructure according to claim 2,
The lower part structure of the vehicle body is characterized in that the outer peripheral part of the battery support member is a cylindrical body having a hollow closed cross-sectional structure.
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